#include<iostream>

using namespace std;

void func1()
{
    cout << "this is func1" << endl;
}

void func2(int a, int b)
{
    cout << "this is func2" << endl;
    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
}
int func3()
{
    cout << "this is func3" << endl;
    return 1000;
}

int func4(int a, int b)
{
    cout << "this is func4" << endl;
    return a + b;
}
int main()
{
    func1();
    func2(1,2);
    cout << func3() << endl;
    cout << func4(1,2) << endl;
    
    return 0;
    
}